Further electrophoretic characterization of strains of Tetrahymena pyriformis.

Mobility patterns of 5 isoenzymes in strains of Tetrahymena pyriformis were demonstrated using polyacrylamide disc gel electrophoresis. Six stock strains were compared in these patterns to 4 strains representative of each of the previously described 4 major "phenotypic sets." Stock strains segregated into predicted "phenosets." and essentially confirmed validity and reproducibility of such a discrimination method. The proposal that new strain designations be assigned on a basis of "phenoset" conformity is reaffirmed.